The first thing we will do is to pass all variables through PHP's htmlspecialchars() function. currently executing script. How to solve the source currently evaluates to an error? 2) In my example I start each error message with the contents of the fields . WebPHP form validation example with demo- Learn how to validate php form with example and demo. We will also do two more things when the user submits the form: The next step is to create a function that will do all the checking for us The validation of data that has been entered in a form is necessary in most cases. This prevents attackers from exploiting the code by injecting HTML or Javascript code If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: